mobileAgent is a client for FreeAgent, which is a SaaS accounting package mostly focused on the UK. I wrote mobileAgent as I needed what it does - scratching my own itch. It allows offline entry of expenses, bills, receipts and mileage, as well as invoice creation and bank account viewing.

Trip Wallet is another "scratch my own itch" app, which lets you record your spending when you are on holiday (or any time). You can enter multiple currencies, and it always resolves it back to your home currency, so you can see how much you have spent, and if you are on target or over budget.

I've done a couple for other people, too:

Earnest is an app for tracking income and expendature for very small businesses. It is based around the UK HMRC (IRS) requirement of only Income - Expenses = Tax to pay. This was done on contract for FreeAgent, and won an award from The Scottish Herald.

Educa is an early childhood education startup, and I did their Android and iPad apps. It centers around a ECE center entering in the childs "learning stories", what they did that day, what they learned, how they are doing. It's mostly New Zealand, Australia and Asia-focused. This uses the same core libraries for service and database access across the two platforms.

Could I have done this without Xamarin? yes, of course. But it wouldn't be nearly as much fun, nor would it have been as easy.

We're building Omlet Chat using Xamarin for both Android and iOS. We have over 60,000 lines of shared code and deep platform integrations for both versions. Here are a few libraries we've ported and open sourced along the way.

Goal Weight - inspired by the Hacker's Diet and my own struggles with weight control. Use the weighted moving average to smooth out daily weight fluctuations and keep yourself working towards your goal.

inSSIDer - Arguably the most popular and the best Wi-Fi monitoring tool available for Windows, Mac, and Android. We use Xamarin + our home-brewed cross-platform framework (inspired hugely by Prism for WPF).

House Alarm is more than a remote control for your Paradox Home Alarm system. You can change arming modes, view system health and get push notifications when your alarm is triggered. https://itunes.apple.com/app/id797462538

Piano Companion is a flexible chord and scale dictionary with user libraries and a reverse mode. Piano Companion allows you to find a chord or scale by its name. If you don't remember the name of the chord or scale, it helps you to find it by keys. Piano Companion shows chord and scale notes, degrees, fingering for both hands in major and minor scales. You can also listen to the scale or chord, to find out how it sounds.
Itunes: http://bit.ly/10UFT96

Songtive is a songwriting tool, band and social network. Songtive allows you to experiment with arrangements and chord progressions. It helps you to organize your favourite songs and chord charts, and to share them with your friends. It's still in progress but we are going to publish it in next couple weeks. http://www.songtive.com

We created the Best Companies app with Xamarin. Available on iPhone (iOS 7 only) and Android. Check out who the best companies to work for in the UK are, see what jobs they have posted and a wealth of other employee and company based information.

Mundo Petit is an iOS App launched in the Brazilian App Apple Store that helps parents-to-be shopping everything their baby will need from 0 to 12 months. It contains a list of suggested products, budget control and stores in the United States.

Audiobook Creator (http://audiobookcreator.codingday.com/) is an app which enables the creation of audiobooks from ebooks. You can listen to it on the go with a music player, smart phone or on your computer.

I've been a .NET web and Windows developer for over 15 years and if I hadn't had Xamarin, the learning curve would have been too great for me to build an iOS app in a reasonable time.
Fortunately, with Xamarin, I was able to use my knowledge of C#, the .NET Framework libraries, and the power of the full Visual Studio environment (including Resharper), which I'm familiar with, to build Shopping UK in just a couple of months. Shopping UK is an elegantly simple shopping list app that automatically categorises your items by supermarket aisle.

I'm currently working on a new version of the app that takes advantage of .NET's powerful support for asynchronous programming mode, which I'm delighted to say, is fully supported by Xamarin.

I've built an app for one of our clients that helps them process new cars coming in from the port. It scans the Vehicle Identification Number and calls a WebAPI that then calls an AS400 to interact with system data. Using Xamarin has made my life easier as I have been able to use portable class libraries on the WebAPI and also use them on the Android project. It makes transferring data across the wire as easy as using the WebAPI client libraries from NuGet. Asynchronous programming has been a breeze with Xamarin.

My Study Life

It's a cross platform student planner (allows you to add classes, store homework etc.) written using the excellent MvvmCross framework.

It was originally written using PhoneGap and although it had decent ratings (around 3.9), it really struggled when a user had a decent amount of data. The bugs were a little more unpredictable and less easy to solve too (not that all Xamarin bugs are easy to solve)! Switching to Xamarin saw an almost instant increase in ratings and also makes it easier to fix bugs / add features across all platforms

Most of my apps are done as contract work and I am not allowed to speak about all. Some of them are not public available. But I am proud of them as if they are my very own. ;-)

Just to list a view I am allowed to speak about:

QR Code Scanner is an app that helps to authenticate against the customers product website. It supports iOS and Android.

Telematics is an app that helps farmers keeping track of there machines. This is also available for both Android and iOS. I was also involved in the other apps offered by my client.

TimePunch is a time tracking app. It was my very first app that got to the stores. I am currently working on a total make over of its UI. It is available for Android, iOS and Windows Phone. The WP version was done by the client himself.

All apps using extensively C# and I could not have done this without Xamarin.

I'm also working on a Google Glass app created with Xamarin. It's a simple card based app that displays the current scores on the PGA Tour. I'm hoping to get back to it and make it look better and work better (better UX for web service loading, etc) after I'm done with the Mobile Midwest Android port.

My first Xamarin app, AvaTourGuide, a virtual guide that verbally announces what's around you using your device's TTS capabilities. Perfect for breaking the boredom of long drives or learning about your own neighbourhood.

A companion website at avatourguide.com enables crowdsourcing of new points of interest.

Version 1.1 refactored with MVVMCross with an iOS version in the works.

I too have created a number of apps for clients which I don't have permission to post publicly, however I can say I've rescued at least a couple of projects that started out as hybrid apps and the companies abandoned ship to rebuild them natively. They were in each case more than happy with the results, especially considering the time and cost savings with me using Xamarin tools to get the job done!

I do have a couple of apps I can share.

gTunes - Google Music for Mac - http://gtunes.altusapps.com
This app is actually a Xamarin.Mac app which adds a bunch of additional functionality to Google Music's already awesome web app. It adds things such as keyboard play/pause/next/prev media key support, now playing notifications, Last.FM scrobbling, and a much needed 'mini player' mode.

Squash - Mac App Store
Squash is a beautifully simple yet powerful tool designed to help print shops and designers layout their desired image onto whatever size page they need. It also allows them to add dynamic fields such as numbering or sets of custom codes onto their design. It's a tool to help you skip the boring stuff, save time, and leave the office a little early.

Aegis Shield MobileiOS App StoreAndroid Play Store
This app is the interface into a very rich database of nutrients, supplements, and health products. The Aegis Shield program is partnered with several major pro athlete organizations to provide them with information on the products they are looking to use, to ensure they adhere to their respective program's strict policies on performance enhancements.

The Healthline.ca Coming Soon
This app provides individuals in their communities find available health services for a variety of needs. The app is going live soon on Android, iOS, and Blackberry (which is still fairly popular in this area - the blackberry version is the same Xamarin built app for Android!)

I've also made a number of Xamarin components, that frankly, without the platform existing I would never have had any interest in creating or using. Xamarin has made this all possible:

NMT SetupWindows Phone storePlay storeiTunes An app I have done at work. It needs a log in to work. It is an app for our recently launched product called Noise Sentinel On Demand, which is a subscription service, where you "rent" some Noise Monitoring Terminals (NMTs). Then you have the possibility to download the NMT Setup app which helps you setting up the Terminal. It validates the setup, you can geographically position the NMT, take a picture of it and write a small description of its surroundings.
Then there is a web app where you can monitor the terminals, get alerts if the environment is too noisy, generate reports for the authority etc. We are working on expanding the apps with more features to help the customers.
I've also been doing a proof of concept of that web app on the phone, to monitor the NMTs.

BatteryDrainerPlay store an app I made because I had some issues with a Moto G's battery. So it had to be drained for power. Hence, I made my own app for that.

I am also the author of LegacyBar with lots of help from @JamesMontemagno‌ (pretty cool guy) and loads of other libraries which I have ported over, such as SlidingMenuSharp, ViewPagerIndicator, SmoothProgressBar, SlidingUpPanel and more which can be found on GitHub.

Currently, I am in the process of porting our iOS app over to Xamarin Android and MvvmCross. I am a good portion of the way done with it. It's connecting to a custom Bluetooth LE device that we built and transmitting data across BLE using an MvvmCross plugin that I built. I don't have anything that is publicly available for showing yet, but should have something in the next month or so.

I have now been developing with Xamarin for nearly 3 years now. My first project was an app called My Media Center for my previous employer. It is an app that allows you to control & manage your Windows Media Center DVR at home or while away. It launched for Android, iOS, and Windows Phone all on the same day with 70% code shared between them. It was then launched on Windows Store a few months after Windows 8 was released.

Since then I have worked on a few more personal projects:

Meetup Manager

This is a tool for meetup.com organizers that allows them to sign in via oAuth get a list of their groups and meetings and then check in their members. I basically created it for myself to manage my group, but since then it has had a lot of success. It is now available on Android, iOS, and Windows Phone. Additionally, it is completely open source on GitHub. This is also a great project because I got help from the community on bugs and with the WP version from @EdSnider‌

Soccer Scores - FotMob (iOS version) is made with Xamarin! Started the implementation in November 2010 so we're loyal :-) We're ranked in top 10 in a lot of countries and our Android version (sadly not Xamarin) is #1 in "Germany/Sports/Paid". Have over 5 million downloads in total.

At Modern Medical, Inc, we just released our latest version of TruMobile in the Google Play store using Xamarin Studio as a follow-on to our native iOS version. We chose Xamarin to leverage our .Net experience and knowledge to bring the Android version of TruMobile to market faster. This allowed us to mimic what was already developed on the iOS version of TruMobile in 2 man-months.

Modern Medical is a worker's compensation cost-containment company that provides Pharmacy and Ancillary services for the injured worker to insurance companies, self-insured employers, third party administrator (TPAs), and case management companies. TruMobile allows the injured worker receiving benefits from Modern Medical to find in-network pharmacies, view/email/fax their pharmacy retail card, view list of mediations, view/contact their adjuster(s), search for medication-related information, order supplies, receive notifications for refills on medication and supplies, and many other features to help in managing their work-related injury. TruMobile also offers options for the Adjuster to search and view claims, view/email/fax the pharmacy retail card on a claim, update adjusters on the claim, update the formulary on a claim, and respond to real-time medication rejections at the pharmacy.

I'm already well into version 2.0 for "Count the Kicks!" thanks to all of the things that I learned over the past few months in Xamarin University. Better, faster, JSON, etc. I got a real nice surprise tonight though when my client sent me the following link: